Improved centering-attachment for lathe



waited tattt atletia @Wire i DANIEL KELLY, 0E PHILADELPHIA,PENNSYLVANIA, ASSIGNOR TO HIM- SELF AND WALTER K. LUDWIG, OE SAME PLAGE.

Letters Patent No. 100,772', dated March 15,1870.

nvrrnovnb cENTnRrNG-ATTACHMENT PoR LATHE.

The Schedule referred to in these Letters Patent and making part of thesame.

To all whom 'it may.conce-rn.:` A

Be it known that I, DANIL KELLY, of Philadelphia, in thecounty ofPhiladelphia, and State of Penusylvania, have invented a new` andimproved Centering-Attachment to Lathes and vI do hereby declare thatthe following is' afull, clear, and exact description thereof, whichwill enable others skilled in the art to `make and'use the same,reference beinghad tov the accompanying drawing forming part of thisspecifica-v tion, in which- Figure 1 represents a longitudinal "sectionof` my improved centering-attachment.

Figure 2 is an endrvievlv of the same.

Similar letters of reference indicate corresponding parts.

This invention relates tocentering-attachments for drills, and` consistsin an improvement thereon which will be specified hereinafter. A i l A,in `the drawing, represents the drill-socket, arranged in therevolvingxspindle of a lathe in the ordinary manner. l *y y B is thebitsecured inthe drill-socket A.

Upon the drill-socket is loosely fitted a slide sleeve,

Y C, which has a funnel-shaped inner end, a, that embraces the end ofAth'ebit, as is clearly shown in iig. 1.

'Ihe sleeve can slide on the drill-socket.

A spring, D,bearing against the outer end of the sleeve, holds itforward on the spindle by acting on an adjustablecollar of thedrill-socket.

It will be seen that when the end of a shaft or other article is fittedagainst the end of the bit, it will at the same time enter the funnel,and will in the same be centered and heldl so as long as the bit is incontact with the shaft, while, during the operation of drilling, theshaft orother article is fed forward, the sleeve `will gradually beforced outward, contracting the described, consisting of the socketedspindle A and sleeve C, having the perforated funnel a at one end andtubular enlargement and spring at the other, all

constructed and arranged as and for the purpose specified.

DANIEL KELLY. y

Witnesses WnL'rnnK. LUDWIG, Tnnononn F. Gosovne.

